acid-, acidi-, acido-, -acidity

(Latin: sour [sharp])

1. Sour, tart, sharp to the taste; of the taste of vinegar.
2. A sharp, bitter, or sarcastic quality in speech or writing.
3. A sour substance, in chemistry: A substance belonging to a class of which the commonest and most typical members are sour, and have the property of neutralizing alkalis, and of changing vegetable blues to red; all of which are compounds of hydrogen with another element or elements (oxygen being generally the third element), and in the decomposition of a compound substance are relatively electro-negative, and borne to the positive pole.
acid rain (s) (noun), acidic rain, acidic precipitation; acid rains, acidic rains, acidic precipitations (pl)
1. Rain, or other precipitation that has an excessive concentration of sulfuric or nitric acids.
2. A popular term for the atmospheric deposition of acidified rain, snow, sleet, hail, acidifying gases and particles, as well as, acidified fog and cloud water.
3. Rain, snow, sleet or fog water having a pH less than 5.65.
4. The deposition of acidifying substances from the atmosphere during a precipitation event.
acid test
A decisive test that establishes the worth or credibility of something (from the use of nitric acid to test gold).
A protein that dissolves in acids and shows an acid reaction.
An excess of amino acids in urine.
acidemia, acidaemia
1. A condition in which blood pH is below normal.
2. A condition in which the acidity of the blood is much higher than normal and desirable.

It is one feature of severe untreated diabetes.

Someone who takes the illegal drug LSD regularly (slang).
1. Sour or bitter in taste.
2. Of, pertaining to, or of the nature of, an acid.
Producing or yielding an acid.
acidifiable (adjective), more acidifiable, most acidifiable
Capable of being converted into, or of combining so as to form, an acid: A lot of cheeses are acidifiable by bacteria, which change milk sugars into lactic acid, and with the addition of rennet, the curdling is accomplished.
1. The process of becoming acid, e.g., when soil or water is polluted by acid rain.
2. The act or process of acidifying; conversion into an acid.
Made acid; converted into an acid.
Anything that acidifies, or generates an acid.

The name was originally given (in error) to oxygen, as the supposed active agent in producing acids.

acidify (verb), acidifies; acidified; acidifying
1. To make, turn into, or to become acid.
2. To render as an acid, as by the addition of a strong acid.
Making acid; converting into an acid; having the power to change into an acid.

Oxygen is called the acidifying principle or element.

Cross references of word families that are related directly, or indirectly, to: "sour, sharp": acerb-; acies- (not "sour"); acuto- (not "sour"); oxy-; pung- (not "sour").